I have never made brownies with cannabutter, but I am sure that if you cook the brownies at a temperature higher that the vaporization temp of the thc, you will cook out much of the thc. This is why most foods cooked with alcohol contain very little after they are cooked...the alcohol simply evaporates. Next time you get some butter, make a piece of garlic bread out of it to try it. Toast a piece of bread, then butter it with the cannabutter and add some garlic powder. It can take 1 to 3 hours to begin to feel the effect. It takes effect faster on an empty stomach. I'm not sure what the vape temp of thc is but you should be able to find it on here somewhere....Next time try cooking the brownies at a lower temp than the vape temp of thc. Good Luck